Rotary pump



E. MAHQUET.

ROTARY PUMP.

APPLICATION F|LED JAN.24,1920.

1,404,625, Patented Jan. 24, 1922,

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ATTy.

E. MARQUET.

ROTARY PUMP.

APPLICATION FILED JAN. 24,1920. '1,404,625 Patented Jan. 24, 1922.

2 SHEETS-SHEET 2.

' a subject of the King of Belgium, residing th usaran STATES EUGENE MARQUET, 0F HERSTAL, BELGIUM.

, Bewaar Puur.

Application filed January 24, 1920. Serial No. 353,854.

Speciication of Letters Patent.

Patented J an. 24, 1922.

(GRANTED UNDER THE rnovIsIoNs or THE Aer or MARCH a, 1921, 41 STAT. I..` 1313.)

To all whom t may concern.

Be it known that I, EtGEXE MARQUET, at Herstal, Beigium, have invented certain new and useful Improvements in Rotary Pumps, (for which I have tiled an application in Belgium on the 23rd of August, 1918,) of which the following is a specification.

This invention relates to an improved rotary pump, the object- 0f the invention being to provide an improved'pump of this character so constructed as to operate without the use of valves, and which* is extremely simple in construction and eective in oper- `ation.

A further object of the invention is the provision of a pump of the character set forth, comprising a cylinder having inlet and outlet ports, and a piston rotatable within the cylinder and adapted to alternately open and close sa-id inlet and outlet ports.

A further provision, in a pump of the character set forth, of a rotatable piston and a reciprocable piston in contact with said rotatable piston, the contact surfaces of said pistons being such that the rotation of the rotatable piston will automatically cause longitudinal displacement of the reciprocable piston, thereby to open and close the inlet and outlet orts in proper sequence.

Vith the foregoing and other objects in view, which will appear as the description proceeds, the invention consists in the novel features of construction and combination of parts which.wil1 be more fully set forth hereinafter and particularly pointed out in the claims.

In the drawings accompanying and formpart of this specification, mFig.. 1 illustrates diagrammatically in side and end views a cylinder provided with a single rotary piston showing the principle of the present invention;

Fig. 2 is a diagrammatic view of a cylinder provided with both a rotary and a .reciprocable piston, said pistons being shown with their contiguous end surfaces in enga ent;

. ig. 3 is a. view ofthe cylinder and pistons shown in Fig. 2,

end surfaces of the pistons separated;

Fig. 4 is a side view of a modified form of reciprocable piston;

object of the invention is the but illustrating the M Fig. 5 is a diagrammatic acting pump constructed in e present invention; and.

F 1g. 6 tlon a practical embodiment of the double acting pump shown in 'Fig 6.

he same characters of reference designate the sam parts in the different figures of the drawings;

Referring especially to Fig. 1, C designatesthe pump cylinder provided with inlet and outlet ports O and O respectively', and within which cylinder is disposed a rotatable piston A, the diameter of which is such as to snugly fit within the cylinder for crank S serotation therein by means of a cured to said piston and having a bearing view of. a double accordance with illustrates in sectional side eleva-- in the cylinder head. It will Vbe understood that any other suitable mea-ns may be employed for rotating the piston. The piston A 1s cut at an oblique angle to its axis, as illustrated at PQ in Fig. l, and is incapable of longitudinal movement in the cylinder. It will thus be evident that during rotation of the piston, the p'ortion of the inner surface of the c linder comprised between the planes M ll and N. N is traversed by the angular portion of the piston A, so that the openings or ports O, O are alternately covered and uncovered during such rotation. It will also be observed that the time during which the openings are covered depends upon their location with relation to the planes M, M and N, N. In other words, the nearer the openings are to the plane N, N', the shorter will be the time during which they are covered, and therefore, in the eX- ample shown in Fig. 1, the port O will `be uncovered for a longer time than the port .0. Consequently, it follows that, if the ports are placed diametrically opposite each other and at ual distances from the planes N, N and M, each of the ports will be uncovered during half a revolution of the piston and closed during the other half revolution, one bein closed while the other is open. To avold both ports being partially uncovered at the moment when the covering portion of the piston is passing from one ort to the other 1t 1s necessary merLeIly to ocate the ports nearer the plane Figs. 2 and 3, in addi- ,Referring 110W to tion to the rotatable piston A, a.

mit? A cable piston A is located within the cy the piston A being intended. to be held Y against rotation, by a key and slot connecl l tion with the cylinder, as shown for instance at E in Fig. 5, or by any other suitable means. By means of this structure, it will be seen that with the ports located diainetrically opposite each'other and somewhat nearer the plane M, M that the plane N, N', as above described, when the piston- A is in its position of rest shown in Fi 2, the .oblique surfaces of the pistons' wi be in complete contact and. both of the openings will be closed. 1pon rotation'of the piston A in either direction, however, the covering portion of said piston will pass from one .of said openings whilestill covering the other. At the same time, the oblique surface of'said coveringportion acts on that of the reciprocating piston and forces it back against the tension of the spring R, thus forming van unoccupied space between the pistons, which space increases in volume until the pistons have reached the position shown in Fig. 3, which position'is reached after half a revolution 'of the piston A, when the covering portion has again covered the port that was uncovered. Upon further rotation in the same direction the vport which had so far' remained covered, will be uncovered, while the..piston A', under the action of the spring R will-return toward the piston A until their oblique surfaces are again in complete contact.

From the foregoing it will be seen that by connecting the first port with a. suitable reservoir (not shown) containing a Huid, the vacuumproducedinjthe space formed between the ,pistons when the piston Avmoves away from the piston A, will cause said fluid to be sucked into said space, and upon the return of the iston A toward piston A the fluid wil be forced out through the second port. It will thuspbe obvious that the rotary motion of the pis'- ton A produces the same result as the alternating motions ofthe piston of asingle act.

the cylinder to prevent lateral displafmtllif of the pistons A and shat A reciprm eating piston B is disposed between the plstons A, said reciprocating piston having at each end an oblique surface for cooperation with the oblique surfaces of both rota,- table pistons A and is prevented from rotating with the shaft T by means of a lug or key 'E which is slidable in a longitudinal slot in the cylinder, the said slot be 1 a length. at least equal to the longitu displacement of the rpiston B. In the struc' ture illustrated,`the pistons A are connected by a member V, which may be either a solid rod or a tubular member, passing concentricallythrough all of the pistons. In this form of the device, the use of springs may be avoided if the pistons are so assembled "that when the oblique surface at one end of the piston B is in full contact with o'ne piston, A the oblique surface at the opposite end is out of contact with the other piston A, as shown in Fig. 5, whereby the piston B is alternately reciprocated byftlie rotation of the pistons A in a manner which will bereadily understood. It is, however, necessary, in order to accomplish the reciprocation of the piston B in this manner, that.

each of the oblique surfaces of the pistons- A and B be provided with a suitable chamfer, thereby to prevent wedgiiig of the piston B, while permitting the pistons A to cover and uncover the. ports in proper S8' uence. q In some instances, it may not be desirable to have the oblique surfaces of the piston A shownin Figs. 1 to 3 parallel with each other, and it is to be understood that my invention is not limited thereto, since these surfaces 4may be formed atany desired angle to each other. As anillustration, I have shown them 'in Fig. 4 as converging, this arrangement having the characteristic lof permitting double Ports for inlet or outlet n to be placed on the same generatrix Aor the cylinder C. It will be observed that with v this construction the alternate opening andv iio closing of the outlet'l andinlet ports will be maintained.

In Fig. 6 I have illustrated a practical ein-V f bodiment of the invention in the `form of a double acting pump. In this structure, the

inlet and outlet ports .O and O are in communication with channels K and'K respectively, and. which channels 'are in turn communication with conduits- I-into which 1120y merge the ports whichy may be in communi-l cation with some source of fluid supplyznd .Y which ports are in position to be successively K uncovered lby the pistons A, as ,shownlin'i 1 -dotted lines. The tubes II areinte'ndedrt facilitate the cleaning of` the pump.- communicate at their inner ends 'Withthechannels K and K', and are normally closed at their outer ends by removable Plugs-H"A The cylinder is shown in Fig. 6 as provided with perforated ears Z for permittingit to be secured to a suitable foundationor base.

While I have shown and described the reciprocating piston located between two rotatable pistons, it will be readily understood that this arrangement may be reversed without departing from the spirit and scope of my invention as set forth in the claims appended hereto.

Having thus described my invention, what I claim is:

l. A rotary pump, comprising a cylinder provided with inlet and outlet ports, a rotatable piston in said cylinder and having means for alternately opening and closing said ports in sequence during the rotation of the piston, and a reciprocable piston having means cooperating with said last means for sliding said reciprocable piston in one direction when the inlet ports are open.-

2. A rotary pump, provided with inlet and outlet-ports, a rotatable piston in said cylinder and having means for alternately opening and closing said ports in sequence during the rotation of the piston, a reciprocable means cooperating with said last means for sliding said reciprocable piston in one direction'when the inlet ports are open, and meansfor sliding the reciprocable piston in theopposite direction when the, outlet ports are open.

3v. A rotary pump, having an inlet port rotatable piston in said cylinder and provided with an oblique surface at one end comprising a cylinder whereby said piston: during its rotation alternately opens and closes said ports in sequence, a reciprocable piston having an oblique surface cooperating with the oblique comprising a cylinder piston having y land an outlet port, `a f surface of said rotatable piston for sliding said reciprocable piston in one direction during the rotation of said rotatable piston, and means for sliding said reciprocable piston in the opposite direction.

4. A rotary pump, comprising a cylinder provided with inlet and outlet ports, a pair of pistons` rotatable together within` said cylinder and each provided with an oblique surface at one end thereof for alternately opening and closing said inlet and outlet ports in sequence during the rotation of the pistons, and a reciprocable piston between said rotatable pistons and provided at each' end thereof with an oblique surface cooperating with the oblique surfaces of the rotatable pistons forreciprocating said reciprocable piston during rotation of` said rotatablel pistons.

5. A rotary pump, comprising a cylinder provided with inlet and outlet ports, a pair ofl pistons rotatable together within said cylinder and each provided with an oblique surface at one end thereof for alternately opening and closing said inlet and outlet ports in sequence during the rotation of the pistons, a reciprocable piston between said rotatable pistons and provided at each end thereof with an oblique surface cooperating with the oblique surfaces of the rotatable pistons for reciprocating said reciprocable piston during rotation of said rotatable pistons, and means for preventingl rotation of said reciprocable piston.

In testimony that I claim the foregoing as my-`A invention, I have signed myname in Y presence of two subscribing witnesses.

EUGENE MARQUET. Witnesses:

J. GRAU, CURTIS T. Evnnn'rr. 

